贡嘎山蕨类植物区系的特点

贡嘎山蕨类植物区系共含４０科，９３属，３９９种，最主要的是耳蕨属Ｐｏｌｙｓｔｉｃｈｕｍ，鳞毛蕨属Ｄｒｙｏｐｔｅｒｉｓ，蹄盖蕨属Ａｔｈｙｒｉｕｍ以及水龙骨科Ｐｏｌｙｐｏｄｉａｃｅａｅ等系统演化上较高级的类群，所含的种子是喜马拉雅和中国西南当地分化的种；其特有成分多为新特有属，可认为它是随青藏高原隆起而形成的较年青的蕨类区系，热带属在本区数量多而种类少，在山上河可与北温带种类并存。贡嘎山处于蕨类物种东

THE FEATURES OF THE PTERIDOPHYTIC FLORA OF MT.GONGGA(MINYA GONKAR),SICHUAN,CHINA

The pteridophytic nora of Mt. Gongga comprises 399 species, 93 genera, 4o families. Some phylogenically higher taxa including Polystichum, Dryopteris, Athyrium, Polypodiaceae etc. constitute the main body of the flora. From the view of phytogeographical point, the Himalayan species and those differentiated locality in Southwest China are most important for this pteridophytic flora. Moreover, the endemic genera (shared with the neighbour areas) it contains are mostly new endemic. Therefore, it can be said that the pteriophytic flora of Mt. Gongga is a younger one which developed with the heaving of the Qingzang Plateau. The tropical taxa, containing more genera but less species, are companied by the North-temperate components in the higher part of the Mountain. Mt. Gongga, situated in the area through which many east and west distributing boundaries of the species pass, can be taken as the subordinate meriodinal boundary of the Polysticho-Dryopetris Floristic Region.